MongoOperations Vs mongotemplate

I am new to mongo DB with spring integration.

Basically I have created a MongoTemplate and injected that to my DAO layer for DB operations. However when I doing some insert operation, in case of duplicate documents its not throwing any exception/error but it's not even inserting the document as well.

1) Could you please help how to get a exception in case of duplicate document entry.

mongoTemplate.insert(person, "Person");

2) What is the difference between MongoOperations and  mongotemplate